Sodium oxide (Na2O) reacts with water (H2O) to form sodium hydroxide (NaOH). Na2O + H2O > 2NaOH How many grams of sodium oxide are required to produce 160 grams of sodium hydroxide? Type your answer as a single number with 2 significant figures. Make sure to include the correct units in your answer. Units are a type of measurement i. e. gram (g) or mole (mol). Do not include the chemical formula in your answer.

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)